“…Other sites reported include bone (Jones. 1953), mediastinum (Pettit et al, 1954, thyroid (Duffy and Fitzgerald, 1950;Simpson et al, 1955), stomach (Olson et al, 1956), pharynx and larynx (Goolden, 1951(Goolden, , 1957, and tongue (Deller, 1951). The induction of leukaemia following x-ray therapy for ankylosing spondylitis is a special problem and has been fully reviewed by several authors, including Court Brown and Doll (1956).…”